Which device involves the use of plasma in technology?
arc welder
diesel engine
incandescent lightbulb
battery-operated flashlight

Answer : Option A) Arc welder

Explanation : Arc welder is the device, which uses the plasma technology to do welding of metals. The modified version of the device is known as plasma arc welder where the process of welding is observed to be similar to gas tungsten arc welding. Here, the electric arc is found to be formed between an electrode and the workpiece. The only key difference from Gas Tungsten Arc Welding is that in Plasma Arc Welding is that the positioning of the electrode within the body of the torch, in which the plasma arc can be separated from the shielding gas envelope.

Answer : Option A) Arc welder

Explanation : Arc welder is the device, which uses the plasma technology to do welding of metals. The modified version of the device is known as plasma arc welder where the process of welding is observed to be similar to gas tungsten arc welding. Here, the electric arc is found to be formed between an electrode and the workpiece. The only key difference from Gas Tungsten Arc Welding is that in Plasma Arc Welding is that the positioning of the electrode within the body of the torch, in which the plasma arc can be separated from the shielding gas envelope.

there is none because earth is stationary and flat.

i think its 100.

hope this !